Funciones

funciones.swift

func getBound(anArray: [Int], test: (Int, Int) -> Bool) -> Int {
    var bound = anArray[0]
    for item in anArray[1..<anArray.count] {
        if test(item, bound) {
            bound = item
        }
    }
    return bound
}

func greaterThan(a: Int, b: Int) -> Bool {
    return a > b
}

func lessThan(a: Int, b: Int) -> Bool {
    return a < b
}

let anArray = [52, -234, 177, 23, -545, 16, -8, 23, 3, -1]
var aFunction = greaterThan
var bound = getBound(anArray, aFunction)	// bound = 177

aFunction = lessThan
bound = getBound(anArray, aFunction)    	// bound = -545


func chooseFunction(select: Int) -> (Int, Int) -> Bool {
    return select == 1 ? greaterThan : lessThan
}

aFunction = chooseFunction(2)
aFunction(4, 5)